The Evolution of Protoplanetary Discs: Formation of our Dry Earth

M304 (UCT Maths)
Fri, 22/06/2012 - 12:00 - 13:00
Sarah Martin (STSCI)

We describe the evolution of a protoplanetary disc from the initial accretion infall to FU Orionis outbursts to the formation of planetesimals. Protoplanetary discs are thought to contain a dead zone - a region without turbulence (or viscosity) that prevents free flow of material through the disc. Fully turbulent disc models cannot explain the formation of our dry Earth at its current location because the snow line moves inside its orbit. However, if the disc contains a dead zone we show that the snow line is further out and the Earth can form from water devoid planetesimals.